Re: Puzzled (@JDX)
Since Factortame there's been official recognition that certain statutes are of a constitutional nature with the effect that they're not subject to implicit repeal — the normal rule is that if one act says one thing and another says another then the later one wins because the earlier Parliament can't bind the later; however if the earlier is recognised as a constitutional statute by the court then it'll override the later unless the later explicitly says that the former doesn't apply.
Amongst those acts recognised as constitutional is the Human RIghts Act. Since the ECHR which the HRA incorporates protects freedom of speech in Article 10 technically, even in the UK, there are constitutional guarantees of freedom of expression. Though they're explicitly subject to concerns about national security, public safety, etc, etc, so a WBC-style organisation wouldn't be safe.